The DUNHAM COLLET
provides an expanding member to locate and hold work equipment -
lathes, milling machines, grinders, fixtures, etc. - no extra
attachments. Accuracy within .0005 is not unusual on
concentricity and the expanding collet enables you to hold close
shoulder tolerances.

How Is It
Used?

The DUNHAM EXPANDING COLLET is inserted into the spindle
of your machine and its threaded draw bar until the 5C or 16C
taper seats. The conventional movement of the draw bar will
expand and release the soft slotted member.

The soft mandrel may be
machined to fit any I.D. within the range of the collet, i.e.
from 1/4" to 6".

The solid taper on the
collet, once seated, will not draw back into the spindle. Thus
a machined shoulder will hold the width dimensions within
.001". The DUNHAM EXPANDING COLLET may be removed and replaced
in a machine without affecting its accuracy as with any standard
collet. If accuracy to within .0005" is desired, a slight
truing cut will suffice. The collet can operate with the
spindle moving.

DUNHAM COLLETS may be
transferred to any machine using standard 5C collets.
Therefore, it may be switched from machine to machine for use in
turning, grinding, machining, drilling, milling, etc., saving
valuable time.